S1 Toward Inert Paramagnetic Ni(II)-Based Chemical Exchange Saturation Transfer MRI Agents Laura Caneda-Martínez, a Laura Valencia, b Isabel Fernández-Pérez, a Martín Regueiro- Figueroa, a Goran Angelovski, c Isabel Brandariz, a David Esteban-Gómez, a* and Carlos Platas-Iglesias a* Electronic Supplementary Information( ESI) Electronic Supplementary Material (ESI) for Dalton Transactions. This journal is © The Royal Society of Chemistry 2017